Katy perrys style transformation from kooky to glamorous

She was sending a thought-provoking transformation message about love and peace.

And Katy Perry reinforced it with her choice of dress when she hit the stage at the Old Trafford Cricket Ground, in Manchester on Sunday for Ariana Grande's One Love Manchester benefit gig.

The songstress, 32, looked ethereal in a feathered wrap, but when she discarded the cover-up her poignant tribute to the 22 victims of the May terror attack was revealed, with the star wearing their photos on her white mini dress.

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Tribute: Katy Perry made a tribute to the 22 victims of the Manchester terror attack for the One Love concert at the Old Trafford Cricket Ground on Sunday - wearing their photographs on the back of her dress as she took to the stage

Photos: The white dress featured a montage of photos on the back

The white dress featured a montage of photos on the back and across the neckline and cuffs, with viewers soon noticing the photographic tribute online.

'katy perry had all victims faces in the shape of a heart on the back of her dress what an angel,' tweeted one fan, while another gushed:

'The music community stands together with love and in solidarity. I am humbled to be a part of this show.'

Sensational: The Roar hitmaker flaunted her leggy frame in the minidress underneath her kooky jacket, adding a pair of Dear Frances Spirit Boots for the occasion

She's got style: She wore her platinum pixie cut in a tousled style as she belted out her song

Emotional: The I Kissed A Girl hitmaker was moved as she gave the performance of the night

Wow: The Teenage Dream hitmaker was a vision in white as she commanded the attention of the audience

Her performance followed a number of stars including Little Mix, Will.i.am and Miley Cyrus.

The tribute concert, held at Emirates Old Trafford cricket ground, was formally announced by Ariana on Tuesday.

The brave 23-year-old confirmed on Instagram that she would headline the One Love fundraiser for the victims of the attack - a mere two weeks after the tragic suicide bombing that occurred at her Manchester Arena gig, on Monday May 22.

Singing sensation: The crowd went wild as she sang her heart out on stage, pouring her emotions into the tune

Angellic: The blonde bombshell covered up her frame with a feathered cape

These boots are made for walking! The songstress sashayed across the stage in white leather ankle boots

Peace! She raised her hand and gave the peace sign as a tribute to the victims of the attack

Alongside her set, fellow chart-toppers Miley Cyrus, Justin Bieber, Coldplay, Usher, Pharrell Williams, Take That and Niall Horan also confirmed their inclusion by sharing the gig's promotional poster to their social media pages.

All proceeds will go straight to the 'We Love Manchester Emergency Fund', which has been set up by the Manchester City Council in partnership with the British Red Cross to help grieving families and victims of the attack.

Flying: She accentuated her pretty facial features with heavy make-up

Star-studded line-up: Her performance followed a number of stars including Little Mix, Will.i.am and Miley Cyrus

The tragic bombing took place at Ariana's Manchester gig earlier this month, killing 22 people, including children, and injuring 119.

Suicide bomber Salman Abedi, 22, had targeted gig-goers by setting off a 'nail bomb' in the lobby of the Manchester Arena, immediately after Ariana's set finished.

Chilling video footage saw panicked guests screaming and fleeing for the doors, after hearing the sound of the explosion ripping through the venue's exit.

The atrocity marked Britain's deadliest attack since the 7/7 bombings on the London Underground, which killed 52 back in 2005.

Top work: Katy had previously said she was 'humbled' to be part of the ceremony

One Love: Ariana confirmed the star-studded concert, held at the Emirates Old Trafford cricket ground on Tuesday - which would raise money for the victims of the Manchester terror attack